It's being labelled a precautionary measure, but reportedly the Japanese government has issued …
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Aftershocks are being reported as I'm typing this, and coastal areas on both sides of the Pacific are evacuating in fear of further tsunamis (so far the Philippines and Hawaii have been spared any large waves). Here's the link to the Red Cross' relief efforts, and here's footage of the tsunami and quake damage both from on-location video and various news agencies: